A certain UAV can install kinds of payloads at the same time. A kind of Mission Management Computer (MMC) is introduced to manage and make full use of those payloads. All the payloads are controlled by MMC. Telemetry and telecontrol data message of the payloads is managed by MMC. The MMC provide time service for external devices. Payload integration capabilities can be improved by designing the MMC, and achieve independence to run the task system and flight control system. Thus improving the safety of the UAV platform.